[llvm] [SLP][REVEC] Make ShuffleCostEstimator and ShuffleInstructionBuilder can vectorize vector instructions. (PR #99606)

[Alexey Bataev via llvm-commits]

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@@ -12179,6 +12217,8 @@ class BoUpSLP::ShuffleInstructionBuilder final : public BaseShuffleAnalysis {
         }
     }
     int VF = cast<FixedVectorType>(V1->getType())->getNumElements();
+    if (auto *VecTy = dyn_cast<FixedVectorType>(ScalarTy))
+      VF /= VecTy->getNumElements();
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alexey-bataev wrote:

Should this be processed by something similar like getVF or getVF itself?

https://github.com/llvm/llvm-project/pull/99606